Ringed Turtle-Doves also have a laugh-like  heh-heh-heh  call when excited. The White-winged Dove (Zenaida asiatica, also non-native) and the Mourning Dove (Zenaida macroura, a Florida native) are also very similar in size and appearance to the Eurasian Collared-Dove, but neither species has a black collar.
The megagametophyte produces an egg cell (or several egg cells in some groups) for the purpose of fertilization. After fertilization, the ovule develops into a seed.he ovary of the gynoecium produces one or more ovules and ultimately becomes the fruit wall. Ovules are attached to the placenta in the ovary through a stalk-like structure known as a funiculus (plural, funiculi). Different patterns of ovule attachment, or placentation, can be found among plant species, these include:
Also found in: Dictionary, Thesaurus, Medical, Wikipedia. (also ovicell), in plants, the female sex cell; the relatively large nonmotile cell that is the parent cell of a new organism. The egg cell occurs in all higher plants and in certain algae and fungi (in oogamous species it is formed in the oogonia). In bryophytes, Lycopodiales, and gymnosperms the egg cell originates in the archegonia; in angiosperms it is a component of the egg apparatus of the embryo sac. The shape and size of the egg cell vary in different plants.